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2021/03/26

Hsuan-Cheng Wei

TWDC workshop @TSW

Data Cube Live Demo

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Outline

• DC with Jupyter

How to implement data with Jupyter

Case demonstration

• Custom mosaic

• Paddy field survey

• Fusarium wilt of banana in Taiwan

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Data Cube Data Implementation

Data ImportHow does DC data work in Jupyter notebook?

The key is called ‘xarray’.

Xarray introduces labels in the form of dimensions,

coordinates and attributes on top of raw NumPy-like

arrays, which allows for a more intuitive, more

concise, and less error-prone developer experience.

The package includes a large and growing library of

domain-agnostic functions for advanced analytics

and visualization with these data structures.

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Data Import

Export Data

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Custom mosaic

Create median mosaic image

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+ =

2018/11/21 2018/12/17 2018/11/21+2018/12/17

Single Day Searching Result

Single Day Searching Result

Period Searching Result

Customized Mosaic

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Create median mosaic image

Small block division

Create median mosaic

image

Merge image

Create area mask

image

Median Mosaic

Creates cloud-filtered mosaics using the "middle" spectral response of

each band in a time series. Since the bands can vary independently, the

result is often a "synthetic" product that is not representative of any

particular time. This type of mosaic is also possible with radar data.

Create area mask imageCreate median mosaic

Merge image

Thailand area

median mosaic image

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Custom mosaic usingdata cube in Thailand: Demo

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Show results with QGIS

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Paddy field survey

Land cover change: CVA

Spectral index operation: NDVI and NDWI

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Paddy rice detection usingdata cube in Thailand: Preliminary study

Buriram

Study Area: Near by

region around Buriram

Multi-Temporal Remote Sensing Data of 2019

25KM

24

KM

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NDVI (Normalized Difference Vegetation Index) of different periods

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NDWI (Normalized Difference Water Index) of different periods

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Results of Detected Paddy Rice

Paddy rice

SENTINEL-2

(2019/10/21)

Maximum Biomass

SENTINEL-2

(2019/11/20)

Harvested

Estimated paddy rice area: 14477.7(HA)

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Paddy rice detection usingdata cube in Thailand: Demo

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Fusarium wilt of banana in Taiwan

Spectral indices analysis in Data Cube to

detect anomaly of banana trees

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Fusarium wilt of banana

In October, 2019, Fusarium wilt of bananas was

found in Chonglan Farm in Taiwan .

Typical symptoms are chlorosis of leaves and

vascular discoloration.

Infected banana trees were removed and the

soil was processed to prevent further infection.

South Taiwan, Ping Tung

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Banana monitoring using satellite images

Data Cube

Data acquisition and ingestion

Multi-temporal spectral indices analysis

Time series

data of natural

color

composition

images

• Temporal spectral index analysis for

disease area

• Disease feature detection for early

warning

Time series

data of NDVI

images

Time series

data of NDWI

images

Time series

data of false

color

composition

images

Analysis Workflow

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Spectral index analysis

Periods : 2019 / 06 to 2020 / 05

NDWI (Normalized Difference Water Index) of

different periods

NDVI (Normalized Difference Vegetation Index) of different periods

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Disease location Healthy location

2019/11/27

Mid-plant stageHarvest

heading period

2020/02/20

2019/11/27 2020/02/20

Seedling stage

Spectral indices NDVI analysis to detect

anomaly of banana trees

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2019/11/27

2020/02/20

2019/11/27 2020/02/20

Mid-plant stageHarvest

heading period

Seedling stage

Disease location Healthy location

Spectral indices NDWI analysis to detect

anomaly of banana trees

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Fusarium wilt of banana in Taiwanusing data cube : Demo